diff --git a/phf_shared/src/lib.rs b/phf_shared/src/lib.rs
index ec1b61a6..1cb52750 100644
--- a/phf_shared/src/lib.rs
+++ b/phf_shared/src/lib.rs
@@ -88,7 +88,6 @@ macro_rules! delegate_debug(
 );
 
 delegate_debug!(str);
-delegate_debug!([u8]);
 delegate_debug!(char);
 delegate_debug!(u8);
 delegate_debug!(i8);
@@ -144,6 +143,14 @@ impl PhfHash for [u8] {
     }
 }
 
+impl FmtConst for [u8] {
+    #[inline]
+    fn fmt_const(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        // slices need a leading reference
+        write!(f, "&{:?}", self)
+    }
+}
+
 #[cfg(feature = "unicase")]
 impl<S> PhfHash for unicase::UniCase<S>
 where unicase::UniCase<S>: Hash {